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<?php |
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declare(strict_types=1); |
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namespace Churn\Assessor; |
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/** |
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* @internal |
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*/ |
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class CyclomaticComplexityAssessor |
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{ |
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/** |
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* The total cyclomatic complexity score. |
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* |
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* @var integer |
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*/ |
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private $score = 0; |
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/** |
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* Asses the files cyclomatic complexity. |
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* |
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* @param string $contents The contents of a PHP file. |
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*/ |
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public function assess(string $contents): int |
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{ |
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$this->score = 0; |
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$this->hasAtLeastOneMethod($contents); |
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$this->countTheIfStatements($contents); |
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$this->countTheElseIfStatements($contents); |
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$this->countTheWhileLoops($contents); |
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$this->countTheForLoops($contents); |
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$this->countTheCaseStatements($contents); |
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$this->countTheTernaryOperators($contents); |
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$this->countTheLogicalAnds($contents); |
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$this->countTheLogicalOrs($contents); |
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if (0 === $this->score) { |
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$this->score = 1; |
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} |
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return $this->score; |
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} |
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/** |
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* Does the class have at least one method? |
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* |
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* @param string $contents File contents. |
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*/ |
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private function hasAtLeastOneMethod(string $contents): void |
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{ |
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\preg_match("/[ ]function[ ]/", $contents, $matches); |
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if (!isset($matches[0])) { |
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return; |
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} |
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$this->score++; |
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} |
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/** |
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* Count how many if statements there are. |
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* |
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* @param string $contents File contents. |
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*/ |
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private function countTheIfStatements(string $contents): void |
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{ |
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$this->score += $this->howManyPatternMatches("/[ ]if[ ]{0,}\(/", $contents); |
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} |
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/** |
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* Count how many else if statements there are. |
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* |
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* @param string $contents File contents. |
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*/ |
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private function countTheElseIfStatements(string $contents): void |
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{ |
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$this->score += $this->howManyPatternMatches("/else[ ]{0,}if[ ]{0,}\(/", $contents); |
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} |
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/** |
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* Count how many while loops there are. |
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* |
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* @param string $contents File contents. |
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*/ |
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private function countTheWhileLoops(string $contents): void |
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{ |
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$this->score += $this->howManyPatternMatches("/while[ ]{0,}\(/", $contents); |
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} |
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/** |
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* Count how many for loops there are. |
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* |
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* @param string $contents File contents. |
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*/ |
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private function countTheForLoops(string $contents): void |
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{ |
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$this->score += $this->howManyPatternMatches("/[ ]for(each){0,1}[ ]{0,}\(/", $contents); |
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} |
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/** |
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* Count how many case statements there are. |
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* |
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* @param string $contents File contents. |
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*/ |
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private function countTheCaseStatements(string $contents): void |
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{ |
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$this->score += $this->howManyPatternMatches("/[ ]case[ ]{1}(.*)\:/", $contents); |
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} |
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/** |
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* Count how many ternary operators there are. |
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* |
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* @param string $contents File contents. |
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*/ |
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private function countTheTernaryOperators(string $contents): void |
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{ |
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$this->score += $this->howManyPatternMatches("/[ ]\?.*:.*;/", $contents); |
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} |
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/** |
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* Count how many '&&' there are. |
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* |
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* @param string $contents File contents. |
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*/ |
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private function countTheLogicalAnds(string $contents): void |
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{ |
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$this->score += $this->howManyPatternMatches("/[ ]&&[ ]/", $contents); |
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} |
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/** |
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* Count how many '||' there are. |
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* |
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* @param string $contents File contents. |
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*/ |
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private function countTheLogicalOrs(string $contents): void |
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{ |
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$this->score += $this->howManyPatternMatches("/[ ]\|\|[ ]/", $contents); |
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} |
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/** |
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* For the given $pattern on $string, how many matches are returned? |
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* |
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* @param string $pattern Regex pattern. |
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* @param string $string Any string. |
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*/ |
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private function howManyPatternMatches(string $pattern, string $string): int |
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{ |
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return (int) \preg_match_all($pattern, $string); |
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} |
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} |
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bmitch /
churn-php
